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Simplifying 13x + 15 = x + 87 Reorder the terms: 15 + 13x = x + 87 Reorder the terms: 15 + 13x = 87 + x Solving 15 + 13x = 87 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 15 + 13x + -1x = 87 + x + -1x Combine like terms: 13x + -1x = 12x 15 + 12x = 87 + x + -1x Combine like terms: x + -1x = 0 15 + 12x = 87 + 0 15 + 12x = 87 Add '-15' to each side of the equation. 15 + -15 + 12x = 87 + -15 Combine like terms: 15 + -15 = 0 0 + 12x = 87 + -15 12x = 87 + -15 Combine like terms: 87 + -15 = 72 12x = 72 Divide each side by '12'. x = 6 Simplifying x = 6
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